Simpro Microstacker, User Manual

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User Manual // Simpro Microstacker
Original Instructions // English // v2.0 // August 2022 // Page
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4.3 Carriage jams
Occasionally the bin carriage may become jammed at some point. This is normally a minor
issue which can be easily rectified.
The bin carriage is not powered down – it is lowered by gravity alone.
See §4.5 for details and schematics of the hydraulic system.
4.3.1 Bin carriage jams while raising
If the carriage jams while raising the cause may be either an overweight bin, or a
mechanical fault, such as a bent mast or misaligned sliding block.
4.3.1.1 Overweight bin
1. Lower the bin carriage to ground level.
2. Remove some material from the bin, then try again.
If the pressure-relief valve is adjusted incorrectly, the Microstacker might stall even when
lifting bins that are within the machine’s Safe Working Load (150kg) – see §4.5.2.2 .
4.3.1.2 Mechanical fault
1. If possible, lower the carriage to ground level and remove the bin.
2. Attempt to visually identify the cause of the jamming. The most likely causes are:
a. The mast may have been bent or damaged.
b. Lack of lubrication.
3. With the carriage lowered, rectify the problem by straightening and/or realigning the
mechanical components as required. If the mast is bent, you may need to contact
your agent for support.
4. Carry out several complete lifting cycles to ensure the problem is fully resolved.
4.3.2 Carriage jams while lowering
If the carriage jams on the way down, or has jammed on the way up but will not come
down, it may be due to a hydraulic, electrical, or mechanical fault.
4.3.2.1 Hydraulic or electrical fault
When the LOWER button is pressed, the lowering valve should emit a ‘click’ sound as it
opens. If it does not, the problem may be either a hydraulic or electrical fault.
1. If the lowering valve is receiving a signal but not opening, it may simply need to be
cleaned. This can be carried out by a technician with a knowledge of electro-
hydraulic systems:
a. Provide support for the bin carriage with a sling attached to a forklift or crane.
Never place any part of your body beneath the bin unless it is securely supported.
b. Isolate the battery by pressing the EMERGENCY STOP button, and remove the
covers from the powerpack enclosure.
c. Remove the lowering valve coil from the valve stem.
d. Unscrew the lowering valve cartridge.
e. Clean the cartridge with compressed air.
f. Replace the lowering valve by reversing the above procedure.